3.9×9.9+0.38的简便运算?
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计算如下:
3.9×9.9+0.38
=3.9×(10-0.1)+0.38
=3.9×10-3.9×0.1+0.38
=39-0.39+0.38
=39-0.01
=38.99
3.9×9.9+0.38
=3.9×(10-0.1)+0.38
=3.9×10-3.9×0.1+0.38
=39-0.39+0.38
=39-0.01
=38.99
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3.9×9.9+0.38
=3.9×9.9+3.8×0.1
=3.9×9.9+(3.9-0.1)×0.1
=3.9×9.9+3.9×0.1-0.1×0.1
=3.9×(9.9+0.1)-0.01
=3.9×10-0.01
=39-0.01
=38.99
=3.9×9.9+3.8×0.1
=3.9×9.9+(3.9-0.1)×0.1
=3.9×9.9+3.9×0.1-0.1×0.1
=3.9×(9.9+0.1)-0.01
=3.9×10-0.01
=39-0.01
=38.99
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(3.8+0.1)×9.9+0.38=3.8×9.9+9.9×0.1+(3.8×0.1)=3.8×(9.9+0.1)+9.9×0.1=3.8×10+0.99=38+0.99=38.99
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2021-08-26
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3.9×9.9+0.38
=0.39×99+0.39-0.01
=0.39×(99+1)-0.01
=0.39×100-0.01
=39-0.01
=38.99
=0.39×99+0.39-0.01
=0.39×(99+1)-0.01
=0.39×100-0.01
=39-0.01
=38.99
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